On your deal I would opt for the 3.91 up
I ran from 3.73 to 4.30 in my old pump gas Duster, it ran almost the same ET(10.30s) and MPH(127.) in the 1/4 mile at Woodburn. It seemed like it spent more time in high gear with the 3.73 but it ran almost the same shruggy
The stick tranny with the O.D. should still hook and book with the proper starting line RPM at the drags twocents It won't be easy to get it correct on the first pass but it is doable with some testing scope You can spin or bog on the starting line, your right foot will control that work
BTW, Yukon makes a 3.73 gear set for the 741 center section shruggy Those are the ones I used in my car up

Last edited by Cab_Burge; 02/02/17 05:07 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)